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Drupady [299]
3 years ago
14

What mirror diameter gives 0.1 arc second resolution for infrared radiation of wavelength 2 micrometers?

Physics
1 answer:
Irina18 [472]3 years ago
7 0

Answer:

The diameter of mirror 5\times10^{-6}\ m

Explanation:

Given that,

Wavelength = 2 μm

Resolution = 0.1

We need to calculate the diameter of mirror

Using formula of resolution

resolution=0.25\times\dfrac{wavelength}{diameter}

diameter =0.25\times\dfrac{wavelength}{resolution}

Put the value into the formula

diameter=0.25\times\dfrac{2\times10^{-6}}{0.1}

diameter = 0.000005\ m

diameter = 5\times10^{-6}\ m

Hence, The diameter of mirror 5\times10^{-6}\ m

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Synchronous communications satellites are placed in a circular orbit that is 3.59 107 m above the surface of the earth. What is
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Answer: 0.223 m/s^{2}

Explanation:

We can solve this with the Law of Universal Gravitation and knowing the acceleration due gravity g of an object above the surface of the planet decreases with the distance (height) of this object from the center of the planet.

Well, according to the law of universal gravitation:

F=G\frac{m_{E}m}{r^2}  (1)

Where:

F is the module of the force exerted between both bodies

G=6.67(10)^{-11}\frac{m^{3}}{kgs^{2}} is the gravitational constant

m_{E}=5.98(10)^{24} kg is the mass of the Earth

m are the mass of each communications satellite

r=R_{E}+h is the distance between the center of the Earth and the satellite

R_{E}=6.38(10)^{6} m is the radius of the Earth

h=3.59(10)^{7} m is the height of the satellite, measured from the Earth's surface

On the other hand, we know according to <u>Newton's 2nd law of motion:</u>

F=mg  (2)

Combining (1) and (2):

G\frac{m_{E}m}{r^2}=mg  (3)

Isolating g:

g=\frac{G M_{E}}{r^2}  (4)

Remembering r=R_{E}+h:

g=\frac{G M_{E}}{(R_{E}+h)^2}  (5)

g=\frac{(6.67(10)^{-11}\frac{m^{3}}{kgs^{2}})(5.98(10)^{24} kg)}{(6.38(10)^{6} m+3.59(10)^{7} m)^2}  

Finally:

g=0.223 m/s^{2}  

5 0
3 years ago
Choose whether each of the following statements is true or false. In order to move a massive crate sitting on the floor, the for
velikii [3]

Answer:

 

Explanation:

1. False

The force you apply on crate is equal and opposite to the force that crate applies on you by Newton's third law of motion.

The force must over come the static frictional force between the crate and the  floor.

2. True

The object can move along another direction than the direction of net force. For example, when a car slows down, the net force is opposite to the direction of motion.

3. True

An object moving at constant velocity has zero net force acting on it.

4. False

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6 0
3 years ago
The table and graph below show the distances traveled by two different objects. (3 points)
Aleks04 [339]

Answer:c

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5 0
3 years ago
A __________ is often written as an if/then statement. prediction law theory guess
tino4ka555 [31]
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4 0
3 years ago
Read 2 more answers
A coil consists of 180 turns of wire. Each turn is a square of side d=30 cm, and a uniform magnetic field directed perpendicular
alexira [117]

Answer:

Emf induced i equal to 329.4 volt

Explanation:

Note : Here i think we have to find emf induced in the coil

Number of turns in the coil N= 180

Sides of square d = 30 cm = 0.3 m

So area of the square A=0.3\times 0.3=0.09m^2

Magnetic field is changes from 0 to 1.22 T

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Time interval in changing the magnetic field dt = 0.06 sec

Induced emf is given by

e=-N\frac{d\Phi }{dt}=-NA\frac{dB}{dt}

e=-180\times 0.09\times \frac{1.22}{0.06}=329.4volt

8 0
3 years ago
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